Dust-collector.



No. 639,387. Patented Dec. l9, I899.

- L. S. HOGEBOOM.

DUST COLLECTOR.

(Application filed Feb. 16. 1899.)

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LEVI S. HOGEBOOH, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE KNICKERBOCKER COMPANY, OF JACKSON, MICHIGAN.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent N 0. 689,387,- dated December 19, 1899. Application filed February 16, 1899. Serial No. 705,615. (No model.)

To aZZ whom it may concern:

Be it known that I, LEVI S. HOGEBOOM, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented new and useful Improvements in Dust-Collectors, of which the following is a specification.

This invention relates to that class of dustcolleetors which operate by reason of a whirling movement of the air in which the dust or other solid matter is contained and which embody in their most familiar form an imperforate conical or tapering separating-chamber having a tangential inlet for the dust-laden air, an approximately central outlet for the purified air, which outlet is arranged at the large end of the chamber, and a dust-butlet at the small end of the chamber.

The object of this invention is to improve the efficiency of the machine and the closeness of the separation by an improved construction of the tubular guard which is usually employed in the air-outlet of the separating-chamber.

In the accompanying drawings, Figure 1 is a vertical central section of a dust-collector provided with my improvements. Fig. 2 is a horizontal section in line 2 2, Fig. 1. Fig. 3 is a vertical section at right angles to Fig. 1 and in line 3 3, Fig. 2.

Like letters of reference refer to like parts in the several figures.

A represents the separating-chamber of the dust-collector, preferably composed of an upper cylindrical portion a and a lower tapering or conical portion a. The latter terminates in the usual dust-escape openingb, and the upper cylindrical portion is provided on one side with the usual tangential inlet-spout c for the dust-laden air.

The tubular guard through which the purified air escapes from the separating-chamber is preferably composed of an upper fixed part or section D and a lower vertically-adjustable part or section D. The fixed section D is secured at its upper end in the usual opening formed centrally, or nearly so, in the head E of the upper cylindrical portion of the separating-chamber. The lower adjustable section D fits snugly within the fixed section and can be raised and lowered in the same.

The lower section is preferably provided with vertical slots f, by which the lower portion can be moved up and down on studs y, secured to the inner side of the upper section, whereby the vertical movement of the lower section is limited and displacement of the lower section in a circumferential direction is prevented. The lower part of the lower section D tapers downwardly at about the same angle which is presented by the lower tapering portion of the separating-chamber, and this lower tapering portion of the guard is arranged in the upper portion of the lower tapering portion of the separating-chamber, so that the side of the tapering portion of the guard is about parallel with the side of the tapering portion of the separating-chamber. This lower portion of the guard is provided with downwardly-flaringopenings 72, through which the air passes from the separatingchamber into the guard. The downwardlytapering lips or extensions h of the guard, between which these openings are formed, are preferably connected at their narrow lower ends by a ring '6, which holds the tips of these lips or extensions in theirproper relative position.

That portion K of the guard which is located in line with the tangential inlet-spout c, and therefore in line with the entering current of dust-laden air, is imperforate, so as to form a shield, which prevents interference of the incoming blast of dust-laden air with the outgoing currents of purified air.

The dust-laden air enters the separatingchamber through the tangential inlet-spout and forms awhirling body of air which travels in said chamber spirally downwardly or toward the small end and also inwardly or toward the axis of the chamber. The solid particles are driven into the outer layer of this whirling body of air and are driven in spiral lines along the peripheral wall of the separating-chamber until they finally reach the dust-exitat the small end of the chamher. The airis gradually crowded inwardly or toward the axis of the separating-chamber by the influx of more air and escapes finally into and through the tubular guard. The escaping air reaches first the narrow upper portions of the downwardly-flaring outlet-openings h in the guard and the escape of the air is therefore gradual and increases as the air approaches the axis of the chamber. The purified air is in this manner allowed to escape gradually and in numerous streams, and the point of escape is located so far down in the separating-chamber that the whirling body of air extends well down into the tapering portion of the chamber with full force, thereby causing the current to hold the solid particles with great force against the peripheral wall of the separatingchamber and sweeping said wall and the outer side of the guard with such force that dust deposits are prevented on the same. The separation is thereby improved and the escape of very fine dust particles with the purified air is prevented.

When the guard is made vertically adjustable, the location of its lower slotted portion can be nicely regulated in each-dust-collector. By properly locating the lower portion of the guard with reference to the dustescape opening the spiral air-current can be made to travel down tothe exit without, however, blowing out of the same with consider able force and also without causing a strong central inflow of air through this exit.

I claim as my invention 1. The combination with the tapering separating-chamber having means for causing the dust-laden air to whirl in the same and having an exit for the separated solid matter at its lower small end and an outlet for the purified air at its upper large end, of a tubular guard arranged in said air-outlet and composed of an upper telescopic cylindrical portion, and a vertically-adjustable lower tapering portion, which latter is attached to the lower part of the telescopic portion and provided in its tapering wall, which is open across its lower end, with air-outlet openings which extend from the lower end of the guard upwardly, substantially as set forth.

2. The combination with the separatingchamber having a tangential inlet-spout for the dust-laden air, an exit for the separated solid matter and an outlet for the purified air, of a tubular guard arranged in said outlet and having at its inner end a series of extensions or lips which are separated by openings through which the purified air escapes from the chamber into the guard, and also an imperforate portion which is arranged in line with the inlet-spout and forms an imperforate shield by which interference of the incoming blast with the outgoing current is prevented, substantially as set forth.

Witness my hand this 10th day of February, 1899.

LEVI S. HOGEBOOM.

Witnesses:

W. H. HASTINGS, EDWIN A. MERRILL. 

